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https://issues.apache.org/jira/browse/LUCENE-3282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13062151#comment-13062151
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Michael McCandless commented on LUCENE-3282:
--------------------------------------------

This looks great Shay!

What was the use case for subclassing to translate the filter into OBS?  Is it 
a custom filter cache?  Makes me nervous because the app really should create & 
reuse this OBS filter, usually...

On the Collector: we try to keep our Querys IR-state-free... so it makes me 
nervous to stick a Collector right on the Query.  Can we add a 
CollectorProvider that the Query invokes when it makes the Weight/Scorer?

Instead of NoOpCollector can we just check for null?

> BlockJoinQuery: Allow to add a custom child collector, and customize the 
> parent bitset extraction
> -------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-3282
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3282
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: core/search
>    Affects Versions: 3.4, 4.0
>            Reporter: Shay Banon
>         Attachments: LUCENE-3282.patch
>
>
> It would be nice to allow to add a custom child collector to the 
> BlockJoinQuery to be called on every matching doc (so we can do things with 
> it, like counts and such). Also, allow to extend BlockJoinQuery to have a 
> custom code that converts the filter bitset to an OpenBitSet.

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